Metal detector



FIG. 1 is an osometric view of a metal detector showing our new design;

FIG. 2 is a left end elevational view thereof;

FIG. 3 is a right end elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front side elevational view thereof, the rear side being a mirror image thereof;

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a metal detector, substantially as shown and described. 